Preventing Roof Moss with Zinc Strips | This Old House - Roof moss copper zinc strips
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You can cut strips of zinc flashing (copper and lead work, too) and slide them under a course of roof shingles to kill lichen and moss growing there, or you could. ZincShield Pure Zinc Strip to Avoid Ugly Roof Stains from Moss, Algae, . Made with % Pure Zinc and % Titanium and Copper (inert) for added.